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-rw-r--r--src/util/get_domainname.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/src/util/get_domainname.c b/src/util/get_domainname.c
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+/*++
+/* NAME
+/* get_domainname 3
+/* SUMMARY
+/* network domain name lookup
+/* SYNOPSIS
+/* #include <get_domainname.h>
+/*
+/* const char *get_domainname()
+/* DESCRIPTION
+/* get_domainname() returns the local domain name as obtained
+/* by stripping the hostname component from the result from
+/* get_hostname(). The result is the hostname when get_hostname()
+/* does not return a FQDN form ("foo"), or its result has only two
+/* components ("foo.com").
+/* DIAGNOSTICS
+/* Fatal errors: no hostname, invalid hostname.
+/* SEE ALSO
+/* get_hostname(3)
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include "mymalloc.h"
+#include "get_hostname.h"
+#include "get_domainname.h"
+
+/* Local stuff. */
+
+static char *my_domain_name;
+
+/* get_domainname - look up my domain name */
+
+const char *get_domainname(void)
+{
+ const char *host;
+ const char *dot;
+
+ /*
+ * Use the hostname when it is not a FQDN ("foo"), or when the hostname
+ * actually is a domain name ("foo.com").
+ */
+ if (my_domain_name == 0) {
+ host = get_hostname();
+ if ((dot = strchr(host, '.')) == 0 || strchr(dot + 1, '.') == 0) {
+ my_domain_name = mystrdup(host);
+ } else {
+ my_domain_name = mystrdup(dot + 1);
+ }
+ }
+ return (my_domain_name);
+}